Using Opera Mail as email client is tough for me as its critical user interface make me my hair rip off. On every error I need to call a technical expert to solve my issue. To resolve my problem I decided to migrate from Opera to Outlook. For migration I need a professional MBOX converter as both email tools has different file format. Opera mail has MBOX format and Outlook has PST format. I used Stellar MBOX to PST file converter software and migrate easily from opera Mail to Outlook mailbox and would suggest every user to opt this tool for smooth and risk free MBOX to PST migration.